Manufacture of paper containers



March 10, 1931.

G F. BLIXT MANUFACTURE OF PAPER CONTAINERS Filed June 15, 1929 R Y on E TZ N m .m M w IMJ ..A i s u G Patented. Mar. 10, 1931 UNITED STATES PATENT OFFICE.

vGFU'STAI F. IBLIXT, OF

GLEN ROCK, NEW JERSEY, ASSIGNOR OF ONE-HALF TO JOHN J. KRIESMER, OF HAWTHORNE, NEW JERSEY MANUFACTURE OF PAPER CONTAINERS Application filed June 15,

The underlying object of this invention is to provide the dairyman and other such users with a paper container which is inexpensive and which will come tc him from the manufacturer .with the assurance that its interior is uncontaminated by handling or any foreign bodies admitted since its manufac'ture and which he may then open and fill and then close, all by machine, if desired, and finally forward to the customer wlth the further assurance that the container will safely undergo in transit any reasonable amount of rough handlin and that access to its contents once it is gially sealed cannot be had uithout the fact being apparent that the container has been tampered with.

In the drawing,

Fig. 1 is a side elevation of the finally sealed container;

Fi 2, 3 and 4 are vertical sectional views showing the body and head at three different stages in the operation of forming the joint between them;

Figs. 5 and 6 are similar views showing the body and head at two different stages and illustrating a modification; and

Fig. 7 is a fragmentary sectional new of the material of which the parts may be composed.

The mentioned material may be paper 7 coated or otherwise charged with paraflin wax 8, this being the material commonly used for forming containers where metal 1s not desired and jointing of the parts is present and stiffness and some plasticity are desirable or necessary.

"I: 1 designates the body, substantially tubular in form. Inward of its end 2 is an interior abutment surfaces 3, here tapering toward the opposite end of the body.

4 designates the head or closure. ThlS is characterized by a pre-formed marginal roll 5 which is related as an overhang with res ct to the exterior side of the central portlon of the head.

To form the joint between these two parts the head is introduced into the end 2 and afterwards said end is bent oyer inwardly as b a seaming operation ac ing progres s ively thereon around the axis of the body) 1929. Serial No. 371.107.

and against the roll, thus causing the latter to be compressed between said bentover end and the abutment surface 3. If the abutment surface is tapering, as in the example, the roll 5 will further be caused as an incident of the compression to move in wedging contact therewith, there thus resulting in effect a welding together of the parts, due to their plastic nature, such welding action augmenting the compression in insuring complete hermetic closing of the joint. To complete the resistiveness of the joint to dis turbance, as by the pressure of the contents, the edge of the end 2 of the body is made to engage under the overhang formed by roll 5, as at 6.

Fig. 1 shows a container in which at each end of the body a joint 9 has been formed like the permanent joint above described and shown in section by Fig. 4.

In the best practice of the above stated method the head is forced against said abut ment surface 3 and wedged thereinto previously to the end 2 acting to compress the roll 5 between itself and said surface, as in Fig. 3, so that it is definitely positioned and positively supported at the very outset of that operation. At this oint in the procedure an article of manu acture, to wit, a container, is produced which in itself is useful as will be now pointed out:

Thus the manufacturer may assemble the container parts for shipment to the user so that one head (to form the bottom) would be permanently in place but the other head only wedged in, as in Fig. 3. The dairyman or other such user on receipt of the containers may then draw the latter heads, fill the containers and replace the heads and complete the joint in each case to the condition above described and shown by Fig. 4, all preferably by machinery. In the time between manufacture and receipt of the containers by the user, therefore, their interiors would be protected against handling and all other contamination; and the containers in the'state now being referred to and shown by Fig. 3

wouldpossess certain other advantageous featur'cs, to wit: they would be reinforced by the wedged-in state of their thus Withdrawable heads and such heads would olfer, under their overhangs, purchase to a suitable tool to effect the withdrawal.

In Figs. 5 and 6 a modification is illustrated in which, the portion of the body outward of the abutment surface 3 is itself tapered toward the opposite end of the body as at 2a, so that if the head 4 has a diameter greater than the least (or lowest) diameter of the inner surface of this taper there will occur wedging and the mentioned welding independently of any such that may occur at said surface 3.

The method herein described and hereinafter pointed out distinguishes from any previously proposed method of which I am aware in that the part 5 is pre-formed, whereby certain advantages result, herein pointed out and apparent to those skilled in the art, not resulting if said part is absent or if it is formed contemporaneously with the bending over 0 the body end 2 or 2a.

Having thus fully described my invention what I claim is:

1. The method of closing the end of a tubu- I lar body of stiff sheet material having near said end an interior abutment surface which consists in introducing into said end a head of stiff sheet material having a pre-forrned marginal roll and then bending said end over inwardly and against the head and thus causing the roll to be compressed between said bent-over end and abutment.

2. The method of closing the end of a tubular body of stiff sheet material having near said end an interior abutment surface tapering toward the opposite end of the body which consists in introducing into said end a head of stiff sheet material having a pre-formed marginal roll and then bending said end over inwardly and against the head and thus causing the roll to move in wedging contact with said surface.

3. The method of closing the end of a tubular body of stiff sheet material having near under which a tool for withdrawing the head I may be engaged.

6. The method of closing the end of a tubular body of stiff sheet material having near said end a circumferential inside taper conto the taper but exceeding in diameter thev smaller diameter thereof, and applying pressure to the head to force the roll into said ta er.

n testimony whereof I afiix my signature.

GUSTAF F. BLIXT.

said end an interior abutment surface which consists in introducing into said end a head of stifi sheet material having a pre-formed exterior overhang and then bending said end inwardly around the overhang and causing its edge to engage under the same while supporting said head on said abutment surface. I

4. A container formed of sheet material and including a tubular body and a head wedged into one end of said bodyand having at itsexterior side a marginaloverhang under which a tool for withdrawing the head may be engaged. a

5. A container formed of sheet material and including a tubular body and a head wedged into one end of said body and having its marginal portion curled inwardly and the edge thereof spaced from the outer surface of the head and thereby forming an overhang 

